Linear Expansion Valve - LG R410A Service Manual

Checking Method for Key Components
2.3 Linear Empansion Valve
LEV
M
1
• Pulse signal output value and valve operation
Output(ø) No.
ø1
ø2
ø3
ø4
• Output pulse sequence
- In valve close state: 1
- In valve open state: 8 ¡ 7 ¡ 6 ¡ 5 ¡ 4 ¡ 3 ¡ 2 ¡ 1 ¡ 8
* 1. If LEV open angle is not changed, all of output phase will be OFF
2. If output phase is different or continuously in the ON state, motor will not operate smoothly and start
vibrating.
• LEV valve operation
Valve
close
open
Angle
118 Trouble Shooting Guide
ø5
4
ø4
6
ø3
2
3
ø2
ø1
1 2
ON OFF OFF
ON ON
OFF OFF
OFF OFF OFF
¡ 2 ¡ 3 ¡ 4 ¡ 5 ¡ 6 ¡ 7 ¡ 8 ¡ 1
Full open
open
1350 pulses
pulse
Red 5
White 4
Yellow 3
Orange 2
Blue 1
Output state
3 4 5
OFF OFF
ON OFF OFF
ON ON ON
OFF ON
- At power ON, open angle signal of 1400 pulses out-
put and valve position is set to
If valve is operated smoothly, no noise and vibration
is occurred and if valve is closed. noise occurs.
- If you contact screw driver to LEV, and contact your
ear to driver hand grip. you can confirm the noise
from LEV.
- If liquid refrigerant is in LEV, the noise is lower.
DC 12V Driving
circuit
ø4
ø3
ø2
ø1
6 7 8
OFF ON ON
OFF OFF OFF
OFF OFF OFF
ON ON OFF